Joseph Mammana, an anti-crime crusader and local businessman who contributed thousands of dollars to help find information leading to criminal convictions was arrested Wednesday afternoon after a search warrant turned up a loaded revolver inside his Yardley home.

Mammana works with anti-crime groups to solve murders and missing person cases, but he has a criminal history of his own, too.

His rap sheet includes aggravated assault, fraud and drug possession, among other things.

Agents from the FBI and IRS Criminal Investigation division said they were looking for tax and business records at his Yardley residence and North Philadelphia egg factory when they found a gun.

According to the affidavit, investigators found a .357-caliber Ruger revolver loaded with five live rounds in a bed stand adjacent to where Mammana sleeps. Because his previous felony convictions carried more than a year jail sentence, it is illegal for him to possess a firearm in and affecting interstate and foreign commerce.

The investigation found that the gun was registered to his father, who died in 1979, and that the gun was manufactured and was operable outside of Pennsylvania, which made it illegal for Mammana to possess it.

Mammana’s hearing in U.S. District Court is scheduled for Friday afternoon.